Costume backpack



FIG. 1 is a perspective view of a costume backpack showing my new design;

FIG. 2 is a rear elevational view of the costume backpack;

FIG. 3 is a front elevational view of the costume backpack;

FIG. 4 is a right side view of the costume backpack;

FIG. 5 is a left side view of the costume backpack;

FIG. 6 is a top elevational view of the costume backpack; and,

FIG. 7 is a bottom elevational view of the costume backpack.

The broken lines in the drawings illustrate environmental structure and form no part of the design. 

The ornamental design for a costume backpack, as shown and described. 